Abstract
In the framework of the chiral perturbation theory we obtain the phenomenological relations between decay branches of rare radiative kaon to pion and leptons K + → π+ l + l − and K 0 S → π0 l + l − and meson form factors. The comparison of these results with the present-day experimental data shows us that the ChPT relations for a charge kaon can determine meson form factors from already measured decay rates at high precision level. However, in the case of the neutral kaon decays K 0 → π0 e + e −(μ+μ−) the form factor data are known to a higher precision than data on the differential rates of radiative kaon decay K 0 π0 e + e −(μ+μ−).
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Pervushin, V.N., Shilin, V.I. Chiral phenomenological relations between rates of rare radiative decays of kaon to pion and leptons and the meson form factors. Phys. Part. Nuclei Lett. 8, 13–18 (2011). https://doi.org/10.1134/S1547477111010092
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DOI: https://doi.org/10.1134/S1547477111010092